Copyright © tekmar Control Systems Ltd. 2000
COM
N/O
N/C
120 VAC
INPUT
H
3
4
N
SR 501-4
ONE ZONE
SWITCHING RELAY
T
W
R
24
VAC
6
FUSE
6 AMP
5
LED
INDICATORS
POWER
ZONE 1
R W
ISOLATED
END
SWITCH
ZONE 2
PRIORITY
OFF
ON
24 VAC
TWO ZONE SWITCHING RELAY
SR 502-4
ZONE1
ZC
ZR
CIRCULATORS
X X
THERMOSTATS
THREE ZONE SWITCHING RELAY
SR 503-4
THERMOSTATS (24 VAC)
ZONE 3
120 VAC CIRCULATORS
ACCESSORY
PORT
CONTROLS
THREE ZONE
EXPANDABLE
SR 503-EXP-4
SLAVE
MASTER
RESET
NORMAL
PRIMARY PUMP
POST PURGE
PRIOR. PROTECT
PUMP EXERCISE
30 SEC / 2 WK
4 MIN / 24 HR
LOW LIMIT (ZC)
ZONE3
ZONE2
R W C
EXPANSION
A B C
MAIN
END SWITCH
1 2
NET
120 VOLT CIRCULATORS
PRIMARY
FOUR ZONE SWITCHING RELAY
SR 504-4
ZONE 4
X
FOUR ZONE
SR 504-EXP-4
ZONE4
SIX ZONE SWITCHING RELAY
SR 506-4
ZONE 5
ZONE 6
SIX ZONE
EXPANDABLE SWITCHING RELAY
SR 506-EXP-4
CIRCULATOR
OUTPUT
A
B
C
THERMOSTAT
1
2
RESET OVERRIDE
SR 501-EXP-4
SINGLE ZONE